There are 16 pens (numbered from 1 to 16) that you can used in W.Theiss Hard- and Software programs. A pen has two properties, namely a color and a thickness. All the pens have pre-defined colors and thicknesses that you cannot change at run time in most programs.

The first 8 pre-defined pens are the following:

Pens 9 to 16 are the same as pens 1 to 8 but with a slightly smaller thickness.